2022 Fiscal Year Final Research Report
Change in the North Pacific subtropical gyre due to global warming and its climatic influence
| Project/Area Number |
19K03969
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 17020:Atmospheric and hydrospheric sciences-related
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| Research Institution | Tokyo University of Marine Science and Technology |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
尾形 友道 国立研究開発法人海洋研究開発機構, 付加価値情報創生部門(アプリケーションラボ), 研究員 (60716679)
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 亜熱帯循環 / 地球温暖化 / 水温躍層 / モード水 |
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| Outline of Final Research Achievements |
Analyzing historical hydrographic observations and large ensemble data of the past climate simulation based on climate models, we examine the change in the North Pacific subtropical thermocline and mode waters. We found that the main thermocline becomes deeper in the area off the North America continent and along the southern side of the subtropical gyre, which suggests that the lower subtropical gyre has weakened due to global warming. In addition, we found changes in the thermocline in association with subtropical mode water and central mode water and showed the importance of mode waters especially in the changes in the surface temperature.
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| Free Research Field |
海洋物理学
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| Academic Significance and Societal Importance of the Research Achievements |
北太平洋亜熱帯循環は地球温暖化によりすでに変化している可能性が本研究により初めて示された．さらに，モード水の変動が水温躍層内に水温偏差を形成することを見出し，気候モデルにおけるモード水の現実的な再現が将来予測において重要であることを指摘した．これら得られた成果は，地球温暖化に起因する将来予測に大きく寄与することが期待される．
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